Adam Clarke on Psalms 65:10

Thou waterest the ridges - In seedtime thou sendest that measure of rain that is necessary, in order to prepare the earth for the plough; and then, when the ridges are thrown into furrows, thou makest them soft with showers, so as to prepare them for the expansion of the seed, and the vegetation and developement of the embryo plant.

Thou blessest the springing thereof - Literally, Thou wilt bless its germinations - its springing buds. Thou watchest over the young sprouts; and it is by thy tender, wise, and provident care that the ear is formed; and by thy bountiful goodness that mature grains fill the ear; and that one produces thirty, sixty, or a hundred or a thousand fold.